Is the probability of appearance being inherited from the previous generation small?

As we all know, many diseases are hereditary. In addition, a person's appearance also has certain genetic characteristics. For example, a child's face will be more or less similar to that of his or her parents. This is a very normal physiological phenomenon. There are many sayings among the people about the inheritance of appearance. For example, a daughter inherits her father's appearance. There is also the saying of skipping generations. In fact, these sayings may not have a scientific basis. Here we will introduce some laws of appearance inheritance from a scientific perspective.

Is the probability of appearance being inherited from the previous generation small?

Just look at the genes of the father and mother, which are generally 50% each. For example, if one of the parents has freckles, the probability of the child having freckles is 50%~100%. When one of the parents has a round nose, the probability that the child will have a round nose is 50%~100%. When one of the parents has an arrow nose, the probability of the child having an arrow nose is 100%.

A child born to a curly-haired mother and a straight-haired father will have half-curly hair, and a child born to both parents with curly hair will have 100% curly hair.

Skin color is also hereditary, and black skin is dominant, so if one of the parents has dark skin, the probability of the child also having dark skin is high.

The mother is 35% taller than the father, and the remaining 30% is determined by the environment and nutrition.

The probability of obesity is 80% when both parents are obese, 40% when one parent is obese, and 9% when both parents are thin.

No matter what he looks like, I hope he has a healthy and cute baby! Children's appearance and temperament will change as they grow, so there is no need to worry too much! !

Genetically speaking, humans can even revert to their primitive state, but the chances of this are slim. This situation has happened and is called "atavism", so it is normal for a child to look like his or her grandparents.

From a biological point of view, genes determine the configuration of proteins, but proteins determine a person's body shape, including facial shape and his body shape and gait. So we often say that someone looks like his father or mother, but his father's genes come from the child's grandparents, and half of the child's genes come from his father, so it is not surprising that the child looks like his grandparents.

Genes can be recessive or dominant. If a child looks like his grandparents, it means that the family genes are not manifested in the child's father, which means they are recessive. But they are manifested in the child, which means they are dominant, so the child looks like his grandparents.

I don't know if my answer is clear. If it is not very clear, I suggest you take a look at the high school biology textbook, which talks about genes, heredity, and protein configuration, etc.